Isotope incorporation in broad-snouted caimans (crocodilians)
Summary The trophic ecology and migration of vertebrate species have been increasingly studied using stable isotope analysis. However, this approach requires knowledge on how dietary isotopic values are reflected in consumers' tissues. To date, this information has only been obtained for a hand...
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| Format: | Article |
| Language: | English |
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The Company of Biologists
2013-05-01
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| Series: | Biology Open |
| Subjects: | |
| Online Access: | http://bio.biologists.org/content/2/6/629 |
| _version_ | 1818646748340420608 |
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| author | Stephane Caut |
| author_facet | Stephane Caut |
| author_sort | Stephane Caut |
| collection | DOAJ |
| description | Summary
The trophic ecology and migration of vertebrate species have been increasingly studied using stable isotope analysis. However, this approach requires knowledge on how dietary isotopic values are reflected in consumers' tissues. To date, this information has only been obtained for a handful of ectotherms; in particular, little is known about crocodilians. In this study, diet-tissue discrimination factors (DTDFs) and carbon and nitrogen stable isotope turnover rates were estimated for plasma, red blood cells (RBCs), and muscle obtained from broad-snouted caimans (Caiman latirostris). Individuals were fed two different control diets for 189 days. DTDFs for δ15N (Δ15N) and δ13C (Δ13C) ranged from −2.24‰ to 0.39‰ and from −0.52‰ to 1.06‰, respectively. Isotope turnover rates in tissues, expressed as half-lives, ranged from 11 to 71 days, with plasma<muscle<RBCs. Δ15N was found to be particularly small, even when compared to values found for other ectotherms, a result that may be linked to the unique excretion physiology of crocodilians. These stable isotope incorporation data should help inform future interpretations of isotopic values obtained in the field for this taxon. |
| first_indexed | 2024-12-17T00:51:34Z |
| format | Article |
| id | doaj.art-b082087bb2914032b8a479a263a0638b |
| institution | Directory Open Access Journal |
| issn | 2046-6390 |
| language | English |
| last_indexed | 2024-12-17T00:51:34Z |
| publishDate | 2013-05-01 |
| publisher | The Company of Biologists |
| record_format | Article |
| series | Biology Open |
| spelling | doaj.art-b082087bb2914032b8a479a263a0638b2022-12-21T22:09:45ZengThe Company of BiologistsBiology Open2046-63902013-05-012662963410.1242/bio.2013494520134945Isotope incorporation in broad-snouted caimans (crocodilians)Stephane CautSummary The trophic ecology and migration of vertebrate species have been increasingly studied using stable isotope analysis. However, this approach requires knowledge on how dietary isotopic values are reflected in consumers' tissues. To date, this information has only been obtained for a handful of ectotherms; in particular, little is known about crocodilians. In this study, diet-tissue discrimination factors (DTDFs) and carbon and nitrogen stable isotope turnover rates were estimated for plasma, red blood cells (RBCs), and muscle obtained from broad-snouted caimans (Caiman latirostris). Individuals were fed two different control diets for 189 days. DTDFs for δ15N (Δ15N) and δ13C (Δ13C) ranged from −2.24‰ to 0.39‰ and from −0.52‰ to 1.06‰, respectively. Isotope turnover rates in tissues, expressed as half-lives, ranged from 11 to 71 days, with plasma<muscle<RBCs. Δ15N was found to be particularly small, even when compared to values found for other ectotherms, a result that may be linked to the unique excretion physiology of crocodilians. These stable isotope incorporation data should help inform future interpretations of isotopic values obtained in the field for this taxon.http://bio.biologists.org/content/2/6/629CrocodilianDietExcretionDiscrimination factorFractionationNitrogen enrichmentTurnover |
| spellingShingle | Stephane Caut Isotope incorporation in broad-snouted caimans (crocodilians) Biology Open Crocodilian Diet Excretion Discrimination factor Fractionation Nitrogen enrichment Turnover |
| title | Isotope incorporation in broad-snouted caimans (crocodilians) |
| title_full | Isotope incorporation in broad-snouted caimans (crocodilians) |
| title_fullStr | Isotope incorporation in broad-snouted caimans (crocodilians) |
| title_full_unstemmed | Isotope incorporation in broad-snouted caimans (crocodilians) |
| title_short | Isotope incorporation in broad-snouted caimans (crocodilians) |
| title_sort | isotope incorporation in broad snouted caimans crocodilians |
| topic | Crocodilian Diet Excretion Discrimination factor Fractionation Nitrogen enrichment Turnover |
| url | http://bio.biologists.org/content/2/6/629 |
| work_keys_str_mv | AT stephanecaut isotopeincorporationinbroadsnoutedcaimanscrocodilians |